Green Thunder

iTrader: (11)

Anyone have a set of Cometic head gaskets 4030 bore in stock or for sale??

Anyone running over 15lbs boost with GM MLS?

Last time (before my most recent rod problems) ran GM MLS with only 10 psi and a 100 shot with ARP head bolts and was leaking through 2 cylinders..

Going back together with ARP studs. But more PSI this time around..

8seclt1

for what motor? and what thickness?

Green Thunder

iTrader: (11)

6.0 I thought they only came in a .054 thickness.

parish8

iTrader: (6)

i ran stock gaskets with arp studs to over 16psi many times. probably made 30+runs on them. i also ran 13psi and a 75shot a few times. i had head gasket problems untill i over torqued the head studs. i went 15ft-lbs over what the directions said to and had no more problems.

MIGHTYMOUSE

iTrader: (59)

i have three cometic C5475's one is brand new two have been used once. sell all 3 for $80

Earl H

iTrader: (1)

I have a set of brand new Cometic 4.1bore MLS gaskets...make offer.

LTLHOMER

iTrader: (10)

Harlan runs the GM MLS I believe. I think he's over 15lbs of boost.

MelloYellow

I hate Cometics.

Magic Chicken

iTrader: (1)

Why's that?

Parker TX

iTrader: (16)

What are the best head gaskets for LT1/LS1 applications running over 15lbs of boost.

PurEvl

iTrader: (2)

im running the gm mls now and will push 15psi soon enough

MIGHTYMOUSE

iTrader: (59)

i have run the cometic and the gm mls to 20psi myself with pump gas/meth without problems with either....not that psi is the determining factor for how good a head gasket is...

427

iTrader: (3)

I have a pick up truck with GM MLS gaskets. It has 15 psi daily for the last 15,000 miles with no problems.

Kurt

MelloYellow

Leaking, bad seals, failure even NA after 1 year.

GM MLS is the best way to go if you want a good seal the first time. Not overpriced either.

Green Thunder

iTrader: (11)

How thick are the GM's?

FireHawk22

I order the cometic gaskets for my 383ci from LG motorsport .to lower my CR soo i can use the STS turbo at 10psi with mthanol injectors on my motor.but i need to now how thick the gaskets that i can use to lower my CR from 11.1 to 10.5 or 10.1

wich is better the cometic or MLS to lower my CR.

Green Thunder

iTrader: (11)

Update: GM's are approx .050 thick

Magic Chicken

iTrader: (1)

Is that an approximate number, or are they really .050? +/-.001 makes a slight difference.

y2khawk

iTrader: (5)

Claimed compressed thickness is .052 on GM MLS gaskets.

Mine see 22 to 23 psi

Chris@AP-Engineering

iTrader: (-2)

I'm running GM MLS gaskets, so far we have seen north of 30psi with them. No problems, yet.